Broken Ft Optiflex

I was out on the course today and I was using my brand new ft Optiflex. First time ever using it. Hit the ball like I never have before. Straight and with distance every time.. Decided to go to the range after and 2nd swing I feel my head go flying 30 yards into the range. It snapped right at the end of the shaft. Did I hit the ball wrong or was it a faulty shaft?